EP2618419B1 - Over-current protection method for lithium battery and device thereof - Google Patents

Over-current protection method for lithium battery and device thereof Download PDF

Info

Publication number
EP2618419B1
EP2618419B1 EP11746869.4A EP11746869A EP2618419B1 EP 2618419 B1 EP2618419 B1 EP 2618419B1 EP 11746869 A EP11746869 A EP 11746869A EP 2618419 B1 EP2618419 B1 EP 2618419B1
Authority
EP
European Patent Office
Prior art keywords
over
signal
current
lithium battery
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11746869.4A
Other languages
German (de)
French (fr)
Other versions
EP2618419A2 (en
EP2618419A4 (en
Inventor
Xinyu Liu
Wei Shui
Wei Liu
Shuang PENG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP2618419A2 publication Critical patent/EP2618419A2/en
Publication of EP2618419A4 publication Critical patent/EP2618419A4/en
Application granted granted Critical
Publication of EP2618419B1 publication Critical patent/EP2618419B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to the field of lithium battery application technologies, and in particular, to an over-current protection method and device for a lithium battery.
  • a lithium battery has high energy density, a high voltage of a single cell, a long life-span, no memory effect, and no pollution, and therefore, it is a battery application development trend to adopt the lithium battery for power supply.
  • An application of a lithium battery depends on a battery management system (Battery Management System, BMS), and the BMS needs to perform voltage sampling, temperature sampling, and current sampling on a single cell voltage, so as to determine over-voltage, under-voltage, charging over-current, discharging over-current, high temperature abnormality, and low temperature abnormality, and monitor and manage the lithium battery according to these determining results.
  • BMS Battery Management System
  • a working current of a lithium battery that serves as a power battery is high.
  • To implement bi-directional detection and protection of a current during charging/discharging it is required that detection accuracy is high, a protection action is fast, a protection state can be maintained after a main circuit is cut off during over-current, whether the protection action is released is controllable, and hardware can implement independent protection in the case that software fails, so as to ensure a safe and reliable application.
  • a current detection and protection scheme of a BMS of a power battery in the current market is not mature, and the reliability is low.
  • US20110012564A1 discloses a DC power tool having an interiorly provided lithium battery element and a charging switch includes a safety protection module to eliminate the risk of circuitry bum-out and other dangers resulting from connecting the power tool to a power supply with unmatched rated voltage and rated current when charging the power tool via use of an adapter.
  • Said safety protection module further comprises a locking device in charge of protecting the DC power tool when a charging overcurrent is detected. The safety locking activated by the locking device can be released by removing the adapter.
  • Embodiments of the present invention provide an over-current protection method and device for a lithium battery, where the method and device have high reliability.
  • An embodiment of the present invention provides an over-current protection device for a lithium battery, where the device includes:
  • An embodiment of the present invention further provides an over-current protection method for a lithium battery, where the method includes:
  • a locking unit locks an over-current state of a lithium battery
  • the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • FIG. 1 is a schematic structural diagram of an over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 110 and a circuit cut-off unit 120.
  • the locking unit 110 is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is in the over-current state. After receiving the charging/discharging over-current signal of the lithium battery, the locking unit 110 considers that the lithium battery has already been in the over-current state, and the "lock an over-current state of the lithium battery" herein means that after receiving the charging/discharging over-current signal of the lithium battery, the locking unit 110 always considers that the lithium battery is in the over-current state, even if the lithium battery has returned to normal in a certain period of time.
  • the over-current state herein includes a charging over-current state and a discharging over-current state.
  • the locking unit 110 may implement locking of the over-current state through the following manner: Memory retention is performed on the charging/discharging over-current signal, and once a charging/discharging over-current state occurs, the locking unit 110 keeps outputting a drive signal for cutting off a main circuit.
  • a signal in the locking unit 110 is a low level, where the signal represents the over-current state, and after receiving the charging/discharging over-current signal, the locking unit 110 may continuously output a low level, where the low level is used as the drive signal.
  • the circuit cut-off unit 120 is configured to, after the locking unit 110 locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located.
  • the circuit cut-off unit 120 may drive a path switch of the main circuit through the drive signal, so as to implement the cutting-off of the main circuit.
  • a locking unit locks an over-current state of a lithium battery
  • the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • FIG. 2 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 210, a circuit cut-off unit 220, an identification signal outputting unit 230, and a central processing unit 240.
  • the locking unit 210 is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to indicate that the lithium battery is continuously in the over-current state.
  • the circuit cut-off unit 220 is configured to, after the locking unit 210 locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located.
  • the identification signal outputting unit 230 is configured to output, to the central processing unit 240, an identification signal that is used to represent whether the locking unit 210 has entered an over-current locked state. That is, after the locking unit locks the over-current state of the lithium battery, the identification signal outputting unit 230 may output, to the central processing unit 240, an identification signal indicating that the locking unit 210 has already been in the over-current locked state; and after the locking unit 210 unlocks the over-current locked state, the identification signal outputting unit 230 may output, to the central processing unit 240, an identification signal indicating that the locking unit 210 is no longer in the over-current locked state.
  • the central processing unit 240 is configured to determine whether the locking unit 210 in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit 210, so that the locking unit 210 unlocks the over-current locked state and outputs a drive signal to start the main circuit.
  • An operation of starting the main circuit herein may be completed by the locking unit 210, and may also be completed by one independent unit, for example, a circuit starting unit.
  • a locking unit locks an over-current state of a lithium battery, and the starting and cutting-off of a switch of a main circuit are driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • the locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears.
  • FIG. 3 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 310, a circuit cut-off unit 320, an identification signal outputting unit 330, a central processing unit 340, a detection unit 350, a determining unit 360, and a conversion unit 370.
  • the detection unit 350 is configured to perform bi-directional detection on a charging/discharging current of a lithium battery, so as to obtain a detection signal.
  • the conversion unit 370 may be connected in series to a negative terminal of a main circuit where the lithium battery is located, and the detection unit 350 may be connected in parallel to two ends of the conversion unit 370. In this way, after the conversion unit 370 converts a current signal into a voltage signal, the voltage signal may be received by the detection unit 350, and then the detection unit 350 amplifies the voltage signal through an operational amplifier, so as to obtain the detection signal and transmit the detection signal to the determining unit 360.
  • the conversion unit 370 may be a sampling resistor, and may also be a current divider, a current sensor, or the like.
  • the detection performed on the charging/discharging current signal by the detection unit 350 in this embodiment of the present invention is not limited to the foregoing manner, and other current detection manners used by persons skilled in the art should also fall within the scope of the present invention.
  • the determining unit 360 is configured to complete determination of charging/discharging over-current of the lithium battery according to the detection signal of the detection unit 350, and output a charging/discharging over-current signal to the locking unit 310.
  • the determining unit 360 may specifically compare, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current.
  • a voltage of the detection signal is higher than a first reference voltage, it is considered to be charging over-current, and when the voltage of the detection signal is smaller than a second reference voltage, it is considered to be discharging over-current, thereby outputting the charging/discharging over-current signal to the locking unit 310.
  • the first reference voltage is greater than the second reference voltage.
  • the locking unit 310 is configured to lock an over-current state according to the received charging/discharging over-current signal, so as to indicate that the lithium battery is continuously in the over-current state.
  • the locking unit 310 may also be connected to an interruption pin of the central processing unit 340.
  • the locking unit 310 may send an interruption signal to the central processing unit 340, and when receiving the interruption signal, the central processing unit 340 may consider that the over-current has occurred to the lithium battery, and then the central processing unit 340 may also cut off the main circuit and send alarm information.
  • the circuit cut-off unit 320 is configured to, after the locking unit 310 locks the over-current state of the lithium battery, output a drive signal to cut off the main circuit where the lithium battery is located.
  • the identification signal outputting unit 330 is configured to output, to the central processing unit 340, an identification signal that represents whether the locking unit 310 has entered an over-current locked state.
  • the central processing unit 340 is configured to determine whether the locking unit 310 in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit 310, so that the locking unit 310 unlocks the over-current locked state and outputs a drive signal to start the main circuit.
  • the central processing unit 340 includes a first determining unit 341, a second determining unit 342, an outputting unit 343, and a state detection unit 344, where the first determining unit 341, the second determining unit 342, and the state detection unit 344 each are connected to the outputting unit 343.
  • the first determining unit 341 is configured to determine, by detecting states such as a voltage, temperature, and a current of each cell of a lithium battery, whether a lithium battery group is available.
  • the second determining unit 342 is configured to determine, by detecting a bus-bar voltage, whether an over-current state disappears.
  • the outputting unit 343 is configured to: when the over-current state disappears and the battery group is available, output a level signal as an unlocking signal to the locking unit 310 through an I/O interface.
  • the state detection unit 344 is configured to detect whether the central processing unit works normally, so as to determine whether the level signal output by the outputting unit 343 is correct.
  • the outputting units 343 and the state detection unit 344 may be implemented through three I/O interfaces.
  • the third I/O interface outputs a high level as an unlocking signal.
  • the first I/O interface may output a high level firstly, and then the second I/O interface detects whether the first I/O interface outputs the high level. If it is detected that the first I/O interface outputs the high level, it is proved that the central processing unit 340 works normally, and the high level output by the third I/O interface is reliable.
  • the first I/O interface may output a low level firstly, and then the second I/O interface detects whether the first I/O interface outputs the low level. If it is detected that the first I/O interface outputs the low level, it is proved that the central processing unit 340 works normally.
  • a locking unit locks an over-current state of a lithium battery, and the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • the locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears.
  • a redundancy backup method for preventing a faulty action of an I/O interface of a central processing unit is adopted in this embodiment of the present invention, so that the reliability of a product is greatly improved.
  • FIG. 5 is a schematic flow chart of an over-current protection method for a lithium battery according to an embodiment of the present invention, where the method includes the following steps.
  • S501 Receive a charging/discharging over-current signal of a lithium battery, where the over-current signal herein includes a charging over-current signal or a discharging over-current signal.
  • S502 Lock an over-current state of the lithium battery according to the charging/discharging over-current signal of the lithium battery, so as to indicate that the lithium battery is continuously in the over-current state.
  • the "lock an over-current state of the lithium battery” herein means that after the charging/discharging over-current signal of the lithium battery is received, it is always considered that the lithium battery is in the over-current state (even if the lithium battery has returned to normal in a certain period of time).
  • the locking of the over-current state may be implemented through the following manner: Memory retention is performed on the charging/discharging over-current signal, and once a charging/discharging over-current state occurs, a drive signal for cutting off a main circuit is kept being outputted.
  • a signal that represents the over-current state is a low level
  • the locking unit may continuously output a low-level, where the low level is used as the drive signal.
  • S503 Output the drive signal to cut off a main circuit where the lithium battery is located.
  • the cutting-off of the main circuit may be implemented by the drive signal driving a path switch of the main circuit.
  • a locking unit locks an over-current state of a lithium battery
  • the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • FIG. 6 is a schematic flow chart of another over-current protection method for a lithium battery according to an embodiment of the present invention, where the method includes the following steps.
  • S601 Perform bi-directional detection on a charging/discharging current of a lithium battery, so as to obtain a detection signal.
  • a conversion unit may be connected in series to a negative terminal of a main circuit, and a detection unit is connected in parallel to two ends of the conversion unit.
  • the conversion unit converts a current signal into a voltage signal
  • the voltage signal may be received by the detection unit, and then the detection unit amplifies the voltage signal through an operational amplifier, so as to obtain the detection signal.
  • S602 Complete determination of charging/discharging over-current of the lithium battery according to the detection signal, and output a charging/discharging over-current signal.
  • the determination may be completed through a determining unit.
  • the determining unit may compare, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current, so as to output the charging/discharging over-current signal to a locking unit.
  • S603 Lock an over-current state of the lithium battery according to the charging/discharging over-current signal, so as to continuously indicate that the lithium battery is in the over-current state, output a drive signal to cut off the main circuit, and output, to a central processing unit, an identification signal that has been in an over-current locked state.
  • step S604 Determine whether an unlocking signal sent by the central processing unit is received, if the unlocking signal sent by the central processing unit is received, proceed to step S605; otherwise, go back to step S603 to continuously keep outputting a drive signal for cutting off the main circuit and an identification signal indicating that an over-current locked state has already been entered.
  • the central processing unit determines, according to the identification signal, whether to send an unlocking signal. Specifically, the determination may be performed through the following manner:
  • the central processing unit may also detect whether the central processing unit works normally, so as to determine whether the output unlocking signal is correct.
  • the function may be implemented through three I/O interfaces. For example, an I/O interface 3 outputs a high level as an unlocking signal. To ensure that the high level output by the I/O interface 3 is reliable, an I/O interface 1 may output a high level firstly, and then an I/O interface 2 detects whether the I/O interface 1 outputs the high level. If it is detected the I/O interface 1 outputs the high level, it is proved that the central processing unit works normally, and the high level output by the I/O interface 3 is reliable.
  • the I/O interface 1 may output a low level firstly, and then the I/O interface 2 detects whether the I/O interface 1 outputs the low level. If it is detected the I/O interface 1 outputs the low level, it is proved that the central processing unit works normally.
  • an over-current state of a lithium battery is locked, and the cutting-off of a switch of a main circuit is driven according to a locking state, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • a locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears.
  • a redundancy backup method for preventing a faulty action of an I/O interface of a central processing unit is adopted in this embodiment of the present invention, so that the reliability of a product is greatly improved.
  • the program may be stored in a computer readable storage medium.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), or the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Protection Of Static Devices (AREA)

Description

    FIELD OF THE INVENTION
  • The present invention relates to the field of lithium battery application technologies, and in particular, to an over-current protection method and device for a lithium battery.
    • BACKGROUND OF THE INVENTION
  • At present, a lithium battery has high energy density, a high voltage of a single cell, a long life-span, no memory effect, and no pollution, and therefore, it is a battery application development trend to adopt the lithium battery for power supply. An application of a lithium battery depends on a battery management system (Battery Management System, BMS), and the BMS needs to perform voltage sampling, temperature sampling, and current sampling on a single cell voltage, so as to determine over-voltage, under-voltage, charging over-current, discharging over-current, high temperature abnormality, and low temperature abnormality, and monitor and manage the lithium battery according to these determining results.
  • However, a working current of a lithium battery that serves as a power battery is high. To implement bi-directional detection and protection of a current during charging/discharging, it is required that detection accuracy is high, a protection action is fast, a protection state can be maintained after a main circuit is cut off during over-current, whether the protection action is released is controllable, and hardware can implement independent protection in the case that software fails, so as to ensure a safe and reliable application. However, a current detection and protection scheme of a BMS of a power battery in the current market is not mature, and the reliability is low.
  • US20110012564A1 discloses a DC power tool having an interiorly provided lithium battery element and a charging switch includes a safety protection module to eliminate the risk of circuitry bum-out and other dangers resulting from connecting the power tool to a power supply with unmatched rated voltage and rated current when charging the power tool via use of an adapter. Said safety protection module further comprises a locking device in charge of protecting the DC power tool when a charging overcurrent is detected. The safety locking activated by the locking device can be released by removing the adapter.
    • SUMMARY OF THE INVENTION
  • Embodiments of the present invention provide an over-current protection method and device for a lithium battery, where the method and device have high reliability.
  • An embodiment of the present invention provides an over-current protection device for a lithium battery, where the device includes:
    • a detection unit, configured to perform bi-directional detection on a charging/discharging current of the lithium battery, so as to obtain a detection signal; and
    • a determining unit, configured to complete determination of charging/discharging over-current of the lithium battery according to the detection signal, and output the charging/discharging over-current signal to a locking unit; wherein the locking unit is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is in the over-current state until an unlocking signal is received; and
    • a circuit cut-off unit, configured to, after the locking unit locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located;
    • a central processing unit, configured to determine whether the locking unit in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit, so that the locking unit unlocks the over-current locked state and outputs a drive signal to start the main circuit; and
    • an identification signal outputting unit, configured to output, to a central processing unit, an identification signal that represents whether the locking unit has entered an over-current locked state.
  • An embodiment of the present invention further provides an over-current protection method for a lithium battery, where the method includes:
    • performing bi-directional detection on a charging/discharging current of the lithium battery, so as to obtain a detection signal; and
    • completing determination of charging/discharging over-current of the lithium battery according to the detection signal, and outputting a charging/discharging over-current signal
    • receiving the charging/discharging over-current signal of a lithium battery;
    • locking an over-current state of the lithium battery according to the charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is continuously in the over-current state until an unlocking signal is received;
    • outputting a drive signal to cut off a main circuit where the lithium battery is located;
    • wherein at the same time of the outputting the drive signal to cut off the main circuit where the lithium battery is located, the method further comprises
    • outputting, to a central processing unit, an identification signal that represents whether an over-current locked state has been entered; and
    • the method further comprises: determining whether an unlocking signal sent by the central processing unit is received, if the unlocking signal sent by the central processing unit is received, unlocking the over-current state according to the unlocking signal and outputting the drive signal to start the main circuit; and if the unlocking signal sent by the central processing unit is not received, continuously keeping outputting the drive signal for cutting off the main circuit and the identification signal.
  • In the embodiments of the present invention, a locking unit locks an over-current state of a lithium battery, and the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • To describe the technical solutions in the embodiments of the present invention more clearly, the accompanying drawings required for describing the embodiments are briefly introduced in the following. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
    • FIG. 1 is a schematic structural diagram of an over-current protection device for a lithium battery according to an embodiment of the present invention;
    • FIG. 2 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention;
    • FIG. 3 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention;
    • FIG. 4 is a schematic structural diagram of a central processing unit according to an embodiment of the present invention;
    • FIG. 5 is a schematic flow chart of an over-current protection method for a lithium battery according to an embodiment of the present invention; and
    • FIG. 6 is a schematic flow chart of another over-current protection method for a lithium battery according to an embodiment of the present invention.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
  • The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the embodiments to be described are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
  • FIG. 1 is a schematic structural diagram of an over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 110 and a circuit cut-off unit 120.
  • The locking unit 110 is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is in the over-current state. After receiving the charging/discharging over-current signal of the lithium battery, the locking unit 110 considers that the lithium battery has already been in the over-current state, and the "lock an over-current state of the lithium battery" herein means that after receiving the charging/discharging over-current signal of the lithium battery, the locking unit 110 always considers that the lithium battery is in the over-current state, even if the lithium battery has returned to normal in a certain period of time. The over-current state herein includes a charging over-current state and a discharging over-current state.
  • As an embodiment of the present invention, the locking unit 110 may implement locking of the over-current state through the following manner: Memory retention is performed on the charging/discharging over-current signal, and once a charging/discharging over-current state occurs, the locking unit 110 keeps outputting a drive signal for cutting off a main circuit. For example, a signal in the locking unit 110 is a low level, where the signal represents the over-current state, and after receiving the charging/discharging over-current signal, the locking unit 110 may continuously output a low level, where the low level is used as the drive signal. The circuit cut-off unit 120 is configured to, after the locking unit 110 locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located. For example, the circuit cut-off unit 120 may drive a path switch of the main circuit through the drive signal, so as to implement the cutting-off of the main circuit.
  • In this embodiment of the present invention, a locking unit locks an over-current state of a lithium battery, and the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • FIG. 2 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 210, a circuit cut-off unit 220, an identification signal outputting unit 230, and a central processing unit 240.
  • The locking unit 210 is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to indicate that the lithium battery is continuously in the over-current state.
  • The circuit cut-off unit 220 is configured to, after the locking unit 210 locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located.
  • The identification signal outputting unit 230 is configured to output, to the central processing unit 240, an identification signal that is used to represent whether the locking unit 210 has entered an over-current locked state. That is, after the locking unit locks the over-current state of the lithium battery, the identification signal outputting unit 230 may output, to the central processing unit 240, an identification signal indicating that the locking unit 210 has already been in the over-current locked state; and after the locking unit 210 unlocks the over-current locked state, the identification signal outputting unit 230 may output, to the central processing unit 240, an identification signal indicating that the locking unit 210 is no longer in the over-current locked state.
  • The central processing unit 240 is configured to determine whether the locking unit 210 in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit 210, so that the locking unit 210 unlocks the over-current locked state and outputs a drive signal to start the main circuit. An operation of starting the main circuit herein may be completed by the locking unit 210, and may also be completed by one independent unit, for example, a circuit starting unit.
  • In this embodiment of the present invention, a locking unit locks an over-current state of a lithium battery, and the starting and cutting-off of a switch of a main circuit are driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained. In addition, in this embodiment of the present invention, the locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears.
  • FIG. 3 is a schematic structural diagram of another over-current protection device for a lithium battery according to an embodiment of the present invention, where the device includes a locking unit 310, a circuit cut-off unit 320, an identification signal outputting unit 330, a central processing unit 340, a detection unit 350, a determining unit 360, and a conversion unit 370.
  • The detection unit 350 is configured to perform bi-directional detection on a charging/discharging current of a lithium battery, so as to obtain a detection signal. In this embodiment, the conversion unit 370 may be connected in series to a negative terminal of a main circuit where the lithium battery is located, and the detection unit 350 may be connected in parallel to two ends of the conversion unit 370. In this way, after the conversion unit 370 converts a current signal into a voltage signal, the voltage signal may be received by the detection unit 350, and then the detection unit 350 amplifies the voltage signal through an operational amplifier, so as to obtain the detection signal and transmit the detection signal to the determining unit 360. In this embodiment, the conversion unit 370 may be a sampling resistor, and may also be a current divider, a current sensor, or the like.
  • Definitely, the detection performed on the charging/discharging current signal by the detection unit 350 in this embodiment of the present invention is not limited to the foregoing manner, and other current detection manners used by persons skilled in the art should also fall within the scope of the present invention.
  • The determining unit 360 is configured to complete determination of charging/discharging over-current of the lithium battery according to the detection signal of the detection unit 350, and output a charging/discharging over-current signal to the locking unit 310.
  • As an embodiment of the present invention, the determining unit 360 may specifically compare, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current. When a voltage of the detection signal is higher than a first reference voltage, it is considered to be charging over-current, and when the voltage of the detection signal is smaller than a second reference voltage, it is considered to be discharging over-current, thereby outputting the charging/discharging over-current signal to the locking unit 310. Preferably, the first reference voltage is greater than the second reference voltage.
  • The locking unit 310 is configured to lock an over-current state according to the received charging/discharging over-current signal, so as to indicate that the lithium battery is continuously in the over-current state.
  • As an embodiment of the present invention, the locking unit 310 may also be connected to an interruption pin of the central processing unit 340. When over-current occurs, the locking unit 310 may send an interruption signal to the central processing unit 340, and when receiving the interruption signal, the central processing unit 340 may consider that the over-current has occurred to the lithium battery, and then the central processing unit 340 may also cut off the main circuit and send alarm information.
  • The circuit cut-off unit 320 is configured to, after the locking unit 310 locks the over-current state of the lithium battery, output a drive signal to cut off the main circuit where the lithium battery is located.
  • The identification signal outputting unit 330 is configured to output, to the central processing unit 340, an identification signal that represents whether the locking unit 310 has entered an over-current locked state.
  • The central processing unit 340 is configured to determine whether the locking unit 310 in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit 310, so that the locking unit 310 unlocks the over-current locked state and outputs a drive signal to start the main circuit.
  • As an embodiment of the present invention, and as shown in FIG. 4, the central processing unit 340 includes a first determining unit 341, a second determining unit 342, an outputting unit 343, and a state detection unit 344, where the first determining unit 341, the second determining unit 342, and the state detection unit 344 each are connected to the outputting unit 343.
  • The first determining unit 341 is configured to determine, by detecting states such as a voltage, temperature, and a current of each cell of a lithium battery, whether a lithium battery group is available.
  • The second determining unit 342 is configured to determine, by detecting a bus-bar voltage, whether an over-current state disappears.
  • The outputting unit 343 is configured to: when the over-current state disappears and the battery group is available, output a level signal as an unlocking signal to the locking unit 310 through an I/O interface.
  • The state detection unit 344 is configured to detect whether the central processing unit works normally, so as to determine whether the level signal output by the outputting unit 343 is correct. In this embodiment of the present invention, the outputting units 343 and the state detection unit 344 may be implemented through three I/O interfaces. For example, the third I/O interface outputs a high level as an unlocking signal. To ensure that the high level output by the third I/O interface is reliable, the first I/O interface may output a high level firstly, and then the second I/O interface detects whether the first I/O interface outputs the high level. If it is detected that the first I/O interface outputs the high level, it is proved that the central processing unit 340 works normally, and the high level output by the third I/O interface is reliable. Definitely, when it is verified whether the central processing unit 340 works normally, the first I/O interface may output a low level firstly, and then the second I/O interface detects whether the first I/O interface outputs the low level. If it is detected that the first I/O interface outputs the low level, it is proved that the central processing unit 340 works normally.
  • In this embodiment of the present invention, a locking unit locks an over-current state of a lithium battery, and the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained. In addition, in this embodiment of the present invention, the locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears. Furthermore, a redundancy backup method for preventing a faulty action of an I/O interface of a central processing unit is adopted in this embodiment of the present invention, so that the reliability of a product is greatly improved.
  • FIG. 5 is a schematic flow chart of an over-current protection method for a lithium battery according to an embodiment of the present invention, where the method includes the following steps.
  • S501: Receive a charging/discharging over-current signal of a lithium battery, where the over-current signal herein includes a charging over-current signal or a discharging over-current signal.
  • S502: Lock an over-current state of the lithium battery according to the charging/discharging over-current signal of the lithium battery, so as to indicate that the lithium battery is continuously in the over-current state.
  • The "lock an over-current state of the lithium battery" herein means that after the charging/discharging over-current signal of the lithium battery is received, it is always considered that the lithium battery is in the over-current state (even if the lithium battery has returned to normal in a certain period of time).
  • As an embodiment of the present invention, the locking of the over-current state may be implemented through the following manner: Memory retention is performed on the charging/discharging over-current signal, and once a charging/discharging over-current state occurs, a drive signal for cutting off a main circuit is kept being outputted. For example, a signal that represents the over-current state is a low level, and after the charging/discharging over-current signal is received by a locking unit, the locking unit may continuously output a low-level, where the low level is used as the drive signal.
  • S503: Output the drive signal to cut off a main circuit where the lithium battery is located. For example, the cutting-off of the main circuit may be implemented by the drive signal driving a path switch of the main circuit.
  • In this embodiment of the present invention, a locking unit locks an over-current state of a lithium battery, and the cutting-off of a switch of a main circuit is driven by using the locking unit and a circuit cut-off unit, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained.
  • FIG. 6 is a schematic flow chart of another over-current protection method for a lithium battery according to an embodiment of the present invention, where the method includes the following steps.
  • S601: Perform bi-directional detection on a charging/discharging current of a lithium battery, so as to obtain a detection signal.
  • In this embodiment, a conversion unit may be connected in series to a negative terminal of a main circuit, and a detection unit is connected in parallel to two ends of the conversion unit. In this way, after the conversion unit converts a current signal into a voltage signal, the voltage signal may be received by the detection unit, and then the detection unit amplifies the voltage signal through an operational amplifier, so as to obtain the detection signal.
  • S602: Complete determination of charging/discharging over-current of the lithium battery according to the detection signal, and output a charging/discharging over-current signal. In this embodiment, the determination may be completed through a determining unit. The determining unit, for example, may compare, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current, so as to output the charging/discharging over-current signal to a locking unit.
  • S603: Lock an over-current state of the lithium battery according to the charging/discharging over-current signal, so as to continuously indicate that the lithium battery is in the over-current state, output a drive signal to cut off the main circuit, and output, to a central processing unit, an identification signal that has been in an over-current locked state.
  • S604: Determine whether an unlocking signal sent by the central processing unit is received, if the unlocking signal sent by the central processing unit is received, proceed to step S605; otherwise, go back to step S603 to continuously keep outputting a drive signal for cutting off the main circuit and an identification signal indicating that an over-current locked state has already been entered.
  • After receiving the identification signal, the central processing unit determines, according to the identification signal, whether to send an unlocking signal. Specifically, the determination may be performed through the following manner:
    • determining, by detecting a voltage, temperature, and a current of each cell, whether a lithium battery group state is available;
    • determining, by detecting a bus-bar voltage, whether the over-current state disappears; and
    • when the over-current state disappears and the battery group state is available,
    • outputting a level signal as the unlocking signal through an input/output I/O interface.
  • As an embodiment of the present invention, the central processing unit may also detect whether the central processing unit works normally, so as to determine whether the output unlocking signal is correct. The function may be implemented through three I/O interfaces. For example, an I/O interface 3 outputs a high level as an unlocking signal. To ensure that the high level output by the I/O interface 3 is reliable, an I/O interface 1 may output a high level firstly, and then an I/O interface 2 detects whether the I/O interface 1 outputs the high level. If it is detected the I/O interface 1 outputs the high level, it is proved that the central processing unit works normally, and the high level output by the I/O interface 3 is reliable. Definitely, when it is verified whether the central processing unit works normally, the I/O interface 1 may output a low level firstly, and then the I/O interface 2 detects whether the I/O interface 1 outputs the low level. If it is detected the I/O interface 1 outputs the low level, it is proved that the central processing unit works normally.
  • S605: Unlock the over-current locked state according to the unlocking signal and output a drive signal to start the main circuit.
  • In this embodiment of the present invention, an over-current state of a lithium battery is locked, and the cutting-off of a switch of a main circuit is driven according to a locking state, so that execution of an over-current protection action for the lithium battery no longer depends on a CPU, and even if a CPU software fails, an over-current protection state may still be entered when an over-current state occurs, or original over-current state protection may still be effectively maintained. In addition, in this embodiment of the present invention, a locking unit may further be unlocked by using the CPU, so that a lithium battery power supply system may be recovered for power supply in time when the over-current state disappears. Furthermore, a redundancy backup method for preventing a faulty action of an I/O interface of a central processing unit is adopted in this embodiment of the present invention, so that the reliability of a product is greatly improved.
  • Persons of ordinary skill in the art may understand that all or a part of the procedures of the methods in the foregoing embodiments may be implemented by a computer program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program is run, the procedures of the methods in the foregoing embodiments are performed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), or the like.

Claims (11)

  1. An over-current protection device for a lithium battery, comprising:
    a detection unit (350), configured to perform bi-directional detection on a charging/discharging current of the lithium battery, so as to obtain a detection signal; and
    a determining unit (360), configured to complete determination of charging/discharging over-current of the lithium battery according to the detection signal, and output the charging/discharging over-current signal to a locking unit; wherein
    the locking unit (110)- is configured to lock an over-current state of a lithium battery according to a charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is in the over-current state until an unlocking signal is received; and
    a circuit cut-off unit (120), configured to, after the locking unit locks the over-current state of the lithium battery, output a drive signal to cut off a main circuit where the lithium battery is located;
    a central processing unit (240), configured to determine whether the locking unit in the over-current locked state needs to be unlocked, and if unlocking is needed, output an unlocking signal to the locking unit, so that the locking unit unlocks the over-current locked state and outputs a drive signal to start the main circuit; and
    an identification signal outputting unit (230), configured to output, to a central processing unit, an identification signal that represents whether the locking unit has entered an over-current locked state.
  2. The device according to claim 1, further comprising a conversion unit (370), wherein the conversion unit is connected in series to a negative terminal of the main circuit, and is configured to convert a current signal into a voltage signal, and the detection unit is configured to receive the voltage signal, and amplify the voltage signal through an operational amplifier, so as to obtain the detection signal.
  3. The device according to claim 1, wherein the determining unit (360) is specifically configured to compare, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current, so as to output the charging/discharging over-current signal to the locking unit.
  4. The device according to claim 1, wherein the central processing unit comprises:
    a first determining unit (341), configured to determine, by detecting a voltage, temperature, and a current of each cell, whether a lithium battery group is available;
    a second determining unit (342), configured to determine, by detecting a bus-bar voltage, whether the over-current state disappears; and
    an outputting unit (343), configured to: when the second determining unit determines that the over-current state disappears and the first determining unit determines that the battery group is available, output a level signal as the unlocking signal through an input/output I/O interface.
  5. The device according to claim 4, wherein the central processing unit further comprises a state detection unit (344), configured to detect whether the central processing unit works normally, so as to determine whether the level signal is correct.
  6. The device according to claim 4, wherein the state detection unit comprises a first I/O interface and a second I/O interface, the first I/O interface is configured to output a high level, and the second I/O interface is configured to detect whether the first I/O interface outputs the high level, and if yes, the central processing unit works normally; or, the first I/O interface is configured to output a low level, and the second I/O interface is configured to detect whether the first I/O interface outputs the low level, and if yes, the central processing unit works normally.
  7. An over-current protection method for a lithium battery, comprising:
    performing (S601) bi-directional detection on a charging/discharging current of the lithium battery, so as to obtain a detection signal; and
    completing (S602) determination of charging/discharging over-current of the lithium battery according to the detection signal, and outputting a charging/discharging over-current signal
    receiving (S501) the charging/discharging over-current signal of a lithium battery;
    locking (s502) an over-current state of the lithium battery according to the charging/discharging over-current signal of the lithium battery, so as to continuously indicate that the lithium battery is in the over-current state until an unlocking signal is received;
    outputting (S503) a drive signal to cut off a main circuit where the lithium battery is located, wherein at the same time of the outputting the drive signal to cut off the main circuit where the lithium battery is located, the method further comprises:
    outputting (S603), to a central processing unit, an identification signal that represents whether an over-current locked state has been entered; and
    the method further comprises: determining (S604) whether an unlocking signal sent by the central processing unit is received, if the unlocking signal sent by the central processing unit is received, unlocking (S605) the over-current state according to the unlocking signal and outputting the drive signal to start the main circuit; and if the unlocking signal sent by the central processing unit is not received, continuously keeping outputting the drive signal for cutting off the main circuit and the identification signal.
  8. The method according to claim 7, wherein the completing determination of charging/discharging over-current of the lithium battery according to the detection signal, and outputting the charging/discharging over-current signal comprises:
    comparing, through a comparator, the detection signal with a reference voltage signal that represents charging/discharging over-current, so as to output the charging/discharging over-current signal to a locking unit.
  9. The method according to claim 7, wherein the sending the unlocking signal by the central processing unit comprises:
    determining, by detecting a voltage, temperature, and a current of each cell, whether a lithium battery group is available;
    determining, by detecting a bus-bar voltage, whether the over-current state disappears; and
    when the over-current state disappears and the battery group is available, outputting a level signal as the unlocking signal through an input/output I/O interface.
  10. The method according to claim 9, further comprising:
    detecting, by the central processing unit, whether the central processing unit works normally, so as to determine whether the output level signal is correct.
  11. The method according to claim 10, wherein the detecting, by the central processing unit, whether the central processing unit works normally comprises: outputting a high level by using a first I/O interface, and detecting, by using a second I/O interface, whether the first I/O interface outputs the high level, and if yes, the central processing unit works normally; or, outputting a low level by using a first I/O interface, and detecting, by using a second I/O interface, whether the first I/O interface outputs the low level, and if yes, the central processing unit works normally.
EP11746869.4A 2011-04-18 2011-04-18 Over-current protection method for lithium battery and device thereof Active EP2618419B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/072929 WO2011103827A2 (en) 2011-04-18 2011-04-18 Over-current protection method for lithium battery and device thereof

Publications (3)

Publication Number Publication Date
EP2618419A2 EP2618419A2 (en) 2013-07-24
EP2618419A4 EP2618419A4 (en) 2013-09-11
EP2618419B1 true EP2618419B1 (en) 2014-11-26

Family

ID=44507272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11746869.4A Active EP2618419B1 (en) 2011-04-18 2011-04-18 Over-current protection method for lithium battery and device thereof

Country Status (4)

Country Link
EP (1) EP2618419B1 (en)
CN (1) CN102549833B (en)
ES (1) ES2529347T3 (en)
WO (1) WO2011103827A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102070615B1 (en) 2014-01-28 2020-01-29 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Power adapter, terminal, and method for processing exception of charging loop
CN106253427B (en) 2014-01-28 2018-05-29 广东欧珀移动通信有限公司 Terminal and its battery charging control device and method
CN104332943B (en) * 2014-10-22 2018-03-23 宁德时代新能源科技股份有限公司 Direct current protection circuit
CN107591574A (en) * 2016-07-08 2018-01-16 朱建浩 The protection device of lithium battery
CN107843849A (en) * 2017-12-05 2018-03-27 成都滕达科技有限公司 A kind of remote supervisory device of direct-flow storage battery
CN109613439A (en) * 2018-12-20 2019-04-12 中兴高能技术有限责任公司 A kind of detection method and device of conveyance capacity
CN112134260A (en) * 2020-10-14 2020-12-25 加森电子科技技术(江苏盐城)有限公司 Improved lithium battery GPS anti-theft system and control method thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3739196B2 (en) * 1997-11-25 2006-01-25 ローム株式会社 Battery protection device and battery device using the same
JP3537317B2 (en) * 1998-07-02 2004-06-14 松下電器産業株式会社 Overcurrent protection control device
JP3670522B2 (en) * 1999-07-30 2005-07-13 富士通株式会社 Battery pack
JP4555502B2 (en) * 2001-04-24 2010-10-06 セイコーインスツル株式会社 Battery state monitoring circuit and battery device
JP4254227B2 (en) * 2002-11-28 2009-04-15 ソニー株式会社 battery pack
JP5064914B2 (en) * 2006-08-24 2012-10-31 セイコーインスツル株式会社 Charge / discharge control circuit and battery device
CN200944526Y (en) * 2006-09-01 2007-09-05 中国科技开发院芜湖分院 Charging/discharging protection module of lithium power battery
JP4556929B2 (en) * 2006-09-07 2010-10-06 日立工機株式会社 Electric tool
JP5061935B2 (en) * 2008-02-12 2012-10-31 ミツミ電機株式会社 Battery pack
CN201565924U (en) * 2009-07-17 2010-09-01 南京德朔实业有限公司 DC electric tool

Also Published As

Publication number Publication date
CN102549833A (en) 2012-07-04
CN102549833B (en) 2014-08-20
WO2011103827A3 (en) 2012-03-22
WO2011103827A2 (en) 2011-09-01
ES2529347T3 (en) 2015-02-19
EP2618419A2 (en) 2013-07-24
EP2618419A4 (en) 2013-09-11

Similar Documents

Publication Publication Date Title
EP2618419B1 (en) Over-current protection method for lithium battery and device thereof
EP3800725A1 (en) Thermal runaway detection method, device and system for batteries, and battery management unit
KR101880762B1 (en) Battery management system and battery management method for vehicle
EP3471236B1 (en) Power adapter, terminal, and method for handling anomaly in charing loop
CN108001270B (en) Direct current charging circuit and direct current charging detection method
EP3040733B1 (en) Device, method, and program for specifying abnormality-occurrence area of secondary battery system
JP7039563B2 (en) Monitoring device and power storage system
CN109490768B (en) Redundancy judgment method and system for contactor contact adhesion
US9933488B2 (en) Open circuit voltage checking for a battery system
CN101587972B (en) Double cell control method
WO2013169493A1 (en) Methods and systems for battery management and charger control
EP4123867B1 (en) Smart battery device, and electronic device thereof
CN116235063A (en) System parameter low-power consumption monitoring method
KR102246451B1 (en) Module battery system
CN109149699A (en) Energy storage battery management system and method
KR20150133065A (en) Apparatus and method for determining reference voltage of detecting overcharge of battery
CN116683050A (en) Battery switching method, system, electronic device and storage medium
CN117465276A (en) Anti-overcharging method and system for electric automobile
CN115291120A (en) Battery metering system, electronic equipment and control method
CN116278953A (en) Signal processing method and device for battery management system and storage medium
CN114966414A (en) Battery pack abnormity detection method and device and electronic equipment
CN113910980A (en) Battery cell fault monitoring system and method
CN216751251U (en) Lithium battery power supply system and electric vehicle
CN110138056B (en) Emergency power supply protection method and device
CN116176281B (en) Power battery function safety control method and device, vehicle and storage medium

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130416

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

A4 Supplementary search report drawn up and despatched

Effective date: 20130813

RIC1 Information provided on ipc code assigned before grant

Ipc: H01M 10/052 20100101ALN20130807BHEP

Ipc: H01M 10/44 20060101ALN20130807BHEP

Ipc: H02J 7/00 20060101AFI20130807BHEP

Ipc: H01M 2/34 20060101ALN20130807BHEP

Ipc: H02H 7/18 20060101ALI20130807BHEP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602011011744

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H01M0010440000

Ipc: H02J0007000000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: H02J 7/00 20060101AFI20140521BHEP

Ipc: H01M 10/42 20060101ALN20140521BHEP

Ipc: H01M 10/052 20100101ALI20140521BHEP

Ipc: H01M 2/34 20060101ALI20140521BHEP

DAX Request for extension of the european patent (deleted)
INTG Intention to grant announced

Effective date: 20140619

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 698670

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141215

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602011011744

Country of ref document: DE

Effective date: 20150108

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2529347

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20150219

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20141126

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 698670

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141126

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150326

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150326

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150226

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150227

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602011011744

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20150827

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150418

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150430

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150418

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20110418

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141126

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20240229

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20240311

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20240306

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20240509

Year of fee payment: 14